Insulator pin



A. O. AUSTIN I Jan. 24, 1928.

INSULATOR PIN Filed May 12, 1920 Patented Jan. 24, 1928.

ARTHUR o. Aus'rin; or nhnnnn'ron,

o'mo, Assmnon, BY nsnn ASSIGNMENTS, no i main onronnnssoomrnny, or mnnsnrnnn, 01110.1; conronn'rron on new 1113- Application filed Kay 12, 1920. Serial No. 380,826.

This invention relates to pins fo r supporting insulators for various electrical conduc- 1 tors, and has for its object the provision .ot

devices of the class "named which shall be of i in the following specification, and it is more claim. a w

In the drawings- V i i Fig. 1 is an elevation of one embodiment of the invention witlrparts in section;

Fig. 2 is a horizontal section online 2-2 of Fig. 1;

particularly pointed out intheappended Fig.2; M

Fig. 4 is an elevation with arts in section of a slightly difierent form 0? the invention. Insulators for electrical conductors are supportedin a'variety of ways,.one ofthe common means being by the use oi pins carried b bearing t e insulator fitted over i the end thereof. Such pins are used for supporting insulators ,on'metal and wooden arms and pole to s and also on various constructions other t an regular linewire supports. pinto meetthe requirements to which it is subjected must have the necessary mechamcal strength to withstand the stresses brought upon itandshould notimaterially lower the I flashover voltage ofthe insulator or otherinsulator.

provide the required strength without setting up undue stress in the fragile material of which arise in line construction and other electrical installations Where insulators are i used, and it is also desirable that the pins should be so designed that a large variety can be made from as small a variety of stock as possible.

From the various embodiments of the indrawings and described I the supporting structure and upset or swage asmaller A form the base, it is impossi leto expand the material asufiicient amount to give a base of the required extent.

wise diminish the electrical'efiiciency of the The cost or manufacture should be kept as low as possible and the pin should the insulator which it carries. The pin should also be adaptable to various conditions thatthe pins may swaging-machine from straight-bar stock without the loss of material.

msunnron rm.

the small diameter of the pin body keepsthe outer surface of the body at a maximum distance from the loweredge of the insulator itself. It wlll also be seen that the supporting base and the body portion of the insulator are made in separate parts which-- permits the use of a base having sufficient area so that the cross-arm upon which the base rests will not be crushed under. bending; moment. The construction permits of a balanced arrangement and at the same time does not sacrifice the electrical properties of the insulator. In pins having a small baseformed integrallywith the pin, the

face of the supporting structure so that It is impractical to form a-pin with an integral base of sufiicientarea to overcome this bendin moment upon the pin forces the i i r ,edge 0 the base into contact with the upper Fig. 3 1S averticalsection on line 3+3 of difliculty, for the reason that if the pin is p "out froma piece of stock of large diameter the waste is too great to justify a sufficient expanse of base, and if it is undertaken to iece of stock to tends to form laps or flaws in the metal. Where the base is formed separately from Such operation also the pin and is provided with means to hold 1 i sired extent and shape and pins may be standardized sothat the same pins may be used with a large variety of T supporting bases. A pin may be secured to the base by means of a tapered end fitting in. a tapered socket and the taper may be readily made with a operation is necessary other than the swaging process in order to obtain a good fit for the base.

The taper should be such that the pin will not tend to lift out of the base when a bending moment is applied, and at the same time the taper should preferably be such that thepin will not bend in the small sections, the smaller portion oft-he pin being be so proportioned" No finishing of cracking in the insulator muv be properly "on the. pin.

made,

reinforced bythe base. When the base and body are assembled theyure held together so that theylwill work as it un tary structure and theinein bddy of the pin flllltjfiib inside" moment, oi it may be inf-stepped diametcrs,-if desiret a large variety of ways,

cast or pressed on the pinwhich will form a cushion betweenthe herd metalendthe porcelain, The upper portion of the pin may, under some conditlons,.be provided with aroughened surface, or with resilient flanges or projections to reduce the danger;

Another method; of securing the insulator tor theitop of the; pin is to provide the end of the pin withilnrge orqsnmll threads which can be adapted to a thimbleof Sheet materiel i threaded intowthe insulator. In this construction thethreeded peirtsuney: be cone shaped and the insulator n ayjbe tightenedv down firmly and afterwards theiwme groove lilllflllllg the 1 pin rel base.

supporting base-i 1 v Under: most .conditions, however, the pm so that, the proper arrangement may be secured; for: a; lurgeiveriety ofi (ZOI1Cllh10I1S. t In Fig. ,1 i the reference; character 1 i designatesthemein body-portion of an insulator: j pin which is prefereblymede of metal and which, as shown, is provided. w1th screwu threads 2 at its upper end for receiving the lIlS-Llltltfll.

openingin the cross-arm or structure end tremitytoireceive a: nut 5 undo washer 6 by which the pin- 1's? securely attached to the other supporting,

crossnrmi A socket member- 7 is provided tionof the pin extending through the socket member 7 and base 8 is threaded,ms shown at 9, to receives nut ilflby which the vpin is tightlydrnwn into the socket? and by which it the p n" and the ilsocket andthe buset8 are sembled they; operate as one apiece. The upter-boled to provide the; insulator under; expansion and contraction 1 L 10f; temperature changesi 4 the baseS upon alined by etive to its supporting The thimhles, however; instead ofibe-v ing cone shaped may be cylindrical so thatt they can. he turned upon: the pins to eline the wire grooves without loosening the insulator Where; this arrangement is? the pin can be rigidlyanttached: to; the i and base will be separeblei which will permit combinations of various formsot pine with different kindsiofibasesn brought: to been The lower end of the inis ta pered, as shownnt 3,, and 1s providedwlth an QXlQIlSlOIIJl nwlnch pesses ithrough un which is threaded; at its excaption that the nut 10in with and the base member receive athreaded With this construction,

per end of the opening in the cross-arm for receiving the extension 4 is preferably counspace for the nut 10. Thehase member Sis shaped to conform to the upper face of the cross-arm upon which the pm is supportednnd extends along the 7 to istribute the force to which it esteemed The insulator may-be secured to the pin in depending upon conditions. In some cases leed tip may be over an extended area. In the usual construction the cross'arms for supporting the pins extend transversely of the direction of the line and the reatest stress to which the pins are subjecte isin redirection transverse quently is in the directionioftherlength of OHIIQHGI'OSS-arm a sufficient distance i to the direction of the line which conserve sudden breaking in the pressure exerted by;

occur at Such a break in the pressure would tendto cut or injure the fibers of the wood utpthe edge of the metal and for base members of and covers a considerable area helps to overcome thls defect to it great extent. The

the cross-armsuchghs would; 11 the edge of a flat piece of metallli thus i impair the eifi-i w i ciency of the pin. it This is especially true small extent, rand. the fact that applicauts member: is" elongated culty is further overcomeby slightly curving i the base member 8iupwurdly atits ends, shown at 11 in Fig. 3. comparatively long and The curve lliis made gradual andso overcomes and sudden break insthe pressure face i of the cross-arm.

By providing the pin with ac sepamtelyl formed base 8, itwis the base Ifromordinarystockg and beceusewlh is formed independently lbe made of any extent imemben 7 and the pin 3 possible to roll on stamp by simple manufacturing processes, such an i swaging, so that the entire contmlction may i by the baseSAon the upper of the pin rh it mnyiN "it: desired. The socket 1 may also beformed be cheaplyproducod andiyetwhen iti is sembled, 1t iactsias a smgle stitutes un efficient construction. it it i i The form r of the invention shown in i Fig. 4; is similar to that of :Fi 1 with the extrig. 1 is dispensed itis not necessary to i unit and com n 1 Snis threadedtoh portion 12- on the pin 1;

counter-b0re the opening through the cross-- arm and the pin and suppo tightly clamped together by threading the lower portion of the the base 8.

An insulator the lowerend thereof, a laterally extending separately formed base member having en 5 pin into the openingdn pin comprising en elongated p111 body having a tapered portion adjacent w rtlng base cro opening therein for receiving said pin body, a separately formed socket member having a. tapered socket for receiving the tapered portion of said pin body, a threaded member for securin said pin body, base and socket member in xed relation to one another, and means for holding said members when as sembled in position on a supporting struc ture.

In testimony whereof I have signed my 10 name to this specification on this 7t1 day of Mey A. 1920.

ARTHUR O. AUSTIN. 

